OpenRouter: Migrate python-open-router to official openrouter

[ab3lson]

Proposed change

This MR migrates python-open-router to the official openrouter package. This should alleviate the need to maintain a custom SDK and allows the integration to easily stay up-to-date with OpenRouter capabilities.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies a diff between library versions and ideally a link to the changelog/release notes is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @joostlek, mind taking a look at this pull request as it has been labeled with an integration (open_router) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of open_router can trigger bot actions by commenting:

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• @home-assistant reopen Reopen the pull request.
• @home-assistant unassign open_router Removes the current integration label and assignees on the pull request, add the integration domain after the command.
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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Migrates the OpenRouter integration from the third-party python-open-router SDK to the official openrouter Python SDK, updating the config flow and tests accordingly.

Changes:

• Replaced python-open-router usage with openrouter in the integration config flow.
• Updated OpenRouter test fixtures and config flow tests to mock the official SDK APIs and error types.
• Swapped dependency pins from python-open-router==0.3.3 to openrouter==0.8.0 across manifests and requirement sets.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/components/open_router/test_config_flow.py	Updates mocks/error construction and adapts tests to the official SDK method surface.
tests/components/open_router/conftest.py	Reworks OpenRouter client fixture to patch OpenRouter and return official Model objects.
requirements_test_all.txt	Replaces python-open-router with openrouter for tests.
requirements_all.txt	Replaces python-open-router with openrouter for runtime.
homeassistant/components/open_router/manifest.json	Updates integration requirements to the official SDK.
homeassistant/components/open_router/config_flow.py	Refactors API key validation and model fetching to use openrouter via executor jobs.

[erwindouna]

Suggested change

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	return label
	return result.data.label